Other methods (do google search) include something called a duplicarver
(you can make something similar), stencils (CMT makes kits, including a 3-D
one), and something called a pantograph - used to copy or enlarge/reduce a
drawing. Seems like it would be fairly easy to make something like the old
Koh-i-nor Rapidograph lettering system used by draftsmen, modified to use a
Dermel or cutter head.